Watch a replay of the Delta 4 NROL-47 launch

A commercial rocket under development by Firefly Aerospace will conduct its first orbital test flight in 2019 from a launch pad at Vandenberg Air Force Base in California that will become vacant with the retirement of the venerable Delta 2 booster later this year, the company announced Tuesday.

A pair of covertly developed inspector satellites to monitor collision threats and nefarious activities in geosynchronous orbit for U.S. Strategic Command blasted off aboard a Delta 4 rocket.

A recap of the successful start to Orbital ATK’s OA-7 resupply mission to the International Space Station is given in this post-launch news conference held at NASA’s Kennedy Space Center following the Atlas 5 rocket’s delivery of the Cygnus cargo ship into space.